Gear codes

[chitown906]

I too have the 3.42 with locking rear.. interesting

Chi_Town

 

[SunlitComet]

That locker will blow sooner than later if you stress it a lot. Will be waiting for pictures when it does.

 

[Dazrin]

So, I have stock 3.73 gears and 265/75R16 tires. If I go 315/75R16 tires, it looks like I should be OK with 4.10 gears. I see most people recommend 4.56 though. Is that just for the power? What is the trade-off? 1-2 MPG?

I ask because I can get a 14 bolt rear axle with 4.10s for $150 which will end up being cheaper than putting 4.56 (or 4.10) in my current 10 bolt plus I get a 14 bolt.

It doesn't seem like it would be sacrificing much to do that, but wanted to check what other people thought about this.

 

[bowtiefreak]

you could run on 4.10, but many people like the 4.56 or even 4.88. I run a 315/70/17 and wish I would have done a 4.88 sometimes

 

[LOU A VILLE]

Sorry for bumping this old thread but its stickied so it shouldnt matter to much.

Just looked and my sticker says Gu6 and then G80 right after, How bad is the G80? Im clueless. I will be getting new tires 265/75/16, is 3:42 gearing going to be betteror worse for gas then another? sorry for all the questions, just trying to learn.

 

[bowtiefreak]

for those tires, your gears are fine. You will never see a difference. The G80 can be the start to a bad day....

Do you ofroad the truck or beat the piss out of it on the road? If yes, your days are numbered.

Typically I hear guys toasting them when spinning the tires then catching and BOOM.

I ran one for 8 years with no problem, ignorance was bliss and I had no idea what was in there. I swapped it when I regeared. But many run them for a long time. Others, kill one a year or more.

 

[andrewlee]

I have g80.. & 3.73 should I be ok 33'' tire?

Sent from my LS670 using Tapatalk 2

 

[Donnie Yukonie]

great info , always been told at the dealership mine was the 3.73 not according to my sticker says i have the 3.42 g80

 

[bowtiefreak]

3.42 is a very common ratio. It seems if the truck came with a towing package you will see 3.73 or even 4.10 though.

Andrew: you should be fine with a 3.73 and 33. It's not worth changing to be honest.

 

[Donnie Yukonie]

well thats just it i have the towing package truck came with a class 3 hitch and "heady duty trans something according to my RPO codes guess thats why I and the dealership always assumed it was a 3.73
Z82
VR4
KNP
are all codes i have but appearently i have the smaller ratio? kinda seems a bit odd to me